2010 Cadillac Truck SRX FWD V6-3.0L Page 1192

2010 Cadillac Truck SRX FWD V6-3.0L Page 1192

Circuit/System Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the

HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a

range of 0-1,275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module

uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S

voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed

Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

P0131, P0137, P0151, or P0157

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 3-70 %.

* The DTCs run continuously when the above conditions are met for 2 s.

P0132, P0138, P0152, or P0158

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 0-70 %.

* The DTCs run continuously when the above conditions are met for 3 s.

P2A00 or P2A03

* DTCs P0030, P0036, P0053, P0054, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120,

P0121, P0122, P0123, P0128, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171, P0172, P0174, P0175, P0201,

P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307,

P0308, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1516, P2101, P2119, P2135, P2176 are not set.

* The engine is running.

* The system voltage is between 10-32 V.

* The ECT Sensor parameter is more than 0掳C (32掳F).

* DTCs P2A00 and P2A03 run continuously when the above conditions are met.

Conditions for Setting the DTC

P0131, P0137, P0151, or P0157

* The ECM detects that the HO2S voltage is less than 50 mV.

* The DTCs set within 50 s when the above condition is met.

P0132, P0138, P0152, or P0158

* The ECM detects that the HO2S voltage is greater than 1,050 mV.

* The DTCs set within 50 s when the above condition is met.

P2A00 or P2A03

* The ECM detects that the Fuel Control Loop Status parameter is open.

* DTCs P2A00 and P2A03 set within 30 s when the above condition is met.

Action Taken When the DTC Sets

DTCs P0131, P0132, P0137, P0138, P0151, P0152, P0158, P2A00 and P2A03 are Type B DTCs.

Conditions for Clearing the MIL/DTC